最多保留2位

 <InputNumber 
   min={-10000}
   max={10000}
   formatter={value => {
    return (
      `${value}`
        .replace(/\B(?=(\d{3})+(?!\d))/g, "")
        .replace(/^(-)*(\d+)\.(\d\d).*$/, "$1$2.$3") + '元'
    );
  }}
  parser={value => {
    return value
      .replace(new RegExp('元', "g"), "")
      .replace(new RegExp(/[^0-9.-]/, "g"), "")
      .replace(/^(-)*(\d+)\.(\d\d).*$/, "$1$2.$3");
  }}
   placeholder='请输入'/>

最多保留3位 （以此类推）加\d

<InputNumber 
   min={-10000}
   max={10000}
   formatter={value => {
    return (
      `${value}`
        .replace(/\B(?=(\d{3})+(?!\d))/g, "")
        .replace(/^(-)*(\d+)\.(\d\d\d).*$/, "$1$2.$3") + '元'
    );
  }}
  parser={value => {
    return value
      .replace(new RegExp('元', "g"), "")
      .replace(new RegExp(/[^0-9.-]/, "g"), "")
      .replace(/^(-)*(\d+)\.(\d\d\d).*$/, "$1$2.$3");
  }}
   placeholder='请输入'/>

直接使用precision

<InputNumber 
   min={-10000}
   max={10000}
   precision={2}
   formatter={value => {
    return (
      `${value}` + '元'
    );
  }}
  parser={value => {
    return value.replace(new RegExp('元', "g"), "")
  }}
   placeholder='请输入'/>